/3/ - 3DCG

Help a literal retard here please
I'm just a brainlet who wants to convert models from other games to the Sims 4, and blender is used for this.
I mostly know how to do it already, except because I'm a blender/modeling retard, I have no idea at all what to do when dealing with models that have multiple textures
TLDR: How do I "combine" the textures files into a single one? Plz tell me it's easy and not a 20mins video tutorial.
I already have the textures, just need to combine them into a single one.